Ignition Coil Relay Circuit Troubleshooting

1.Check the No. 2 (15A) fuse in the under-dash fuse/relay box.

Is the fuse OK?


YES - Go to 2.


NO - Replace the fuse.n


2.Remove the ignition coil relay from the under-dash fuse/relay box and test it.

Is the relay OK?


YES - Go to 3.


NO - Replace the ignition coil relay.n


3.Measure the voltage between ignition coil relay 4P socket terminal No. 1 then No. 4 and body ground.

Is there battery voltage?


YES - Go to 4.


NO - Replace the under-dash fuse/relay box.n

4.Check for continuity between ignition coil relay 4P socket terminal No. 2 and the No. 1 igniton coil 3P connector terminal No. 3.

Is there continuity?


YES - Go to 5.


NO - Repair an open in the wire between ignition coil relay 4P socket terminal No. 2 and ignition coil 3P connector terminal No. 3.n


5.Check for continuity between ignition coil relay 4P socket terminal No. 3 and body ground.

Is there continuity?


YES - Repair a short in the wire between ignition coil relay 4P socket terminal No. 3 and ECM/PCM.n


NO - Repair an open in the wire between ignition coil relay 4P socket terminal No. 3 and ECM/PCM.n